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Source at commit 554 created 13 years 8 months ago.
By meklort, Grapics enabler enabled by default. removed device_numbers.
1/*␊
2 * Copyright (c) 1999-2003 Apple Computer, Inc. All rights reserved.␊
3 *␊
4 * @APPLE_LICENSE_HEADER_START@␊
5 * ␊
6 * Portions Copyright (c) 1999-2003 Apple Computer, Inc. All Rights␊
7 * Reserved. This file contains Original Code and/or Modifications of␊
8 * Original Code as defined in and that are subject to the Apple Public␊
9 * Source License Version 2.0 (the "License"). You may not use this file␊
10 * except in compliance with the License. Please obtain a copy of the␊
11 * License at http://www.apple.com/publicsource and read it before using␊
12 * this file.␊
13 * ␊
14 * The Original Code and all software distributed under the License are␊
15 * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER␊
16 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,␊
17 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,␊
18 * FITNESS FOR A PARTICULAR PURPOSE OR NON- INFRINGEMENT. Please see the␊
19 * License for the specific language governing rights and limitations␊
20 * under the License.␊
21 * ␊
22 * @APPLE_LICENSE_HEADER_END@␊
23 */␊
24/* ␊
25 * Mach Operating System␊
26 * Copyright (c) 1990 Carnegie-Mellon University␊
27 * Copyright (c) 1989 Carnegie-Mellon University␊
28 * All rights reserved. The CMU software License Agreement specifies␊
29 * the terms and conditions for use and redistribution.␊
30 */␊
31␊
32/*␊
33 * INTEL CORPORATION PROPRIETARY INFORMATION␊
34 *␊
35 * This software is supplied under the terms of a license agreement or ␊
36 * nondisclosure agreement with Intel Corporation and may not be copied ␊
37 * nor disclosed except in accordance with the terms of that agreement.␊
38 *␊
39 * Copyright 1988, 1989 by Intel Corporation␊
40 */␊
41␊
42/*␊
43 * Copyright 1993 NeXT Computer, Inc.␊
44 * All rights reserved.␊
45 */␊
46␊
47/*␊
48 * Completely reworked by Sam Streeper (sam_s@NeXT.com)␊
49 * Reworked again by Curtis Galloway (galloway@NeXT.com)␊
50 */␊
51␊
52␊
53#include "boot.h"␊
54#include "bootstruct.h"␊
55#include "fake_efi.h"␊
56#include "sl.h"␊
57#include "libsa.h"␊
58#include "ramdisk.h"␊
59#include "platform.h"␊
60#include "graphics.h"␊
61␊
62#include "modules.h"␊
63␊
64long gBootMode; /* defaults to 0 == kBootModeNormal */␊
65bool gOverrideKernel;␊
66static char gBootKernelCacheFile[512];␊
67static char gCacheNameAdler[64 + 256];␊
68char *gPlatformName = gCacheNameAdler;␊
69char gRootDevice[512];␊
70char gMKextName[512];␊
71char gMacOSVersion[8];␊
72#ifndef OPTION_ROM␊
73bool gEnableCDROMRescan;␊
74bool gScanSingleDrive;␊
75#endif␊
76␊
77int bvCount = 0;␊
78//int␉menucount = 0;␊
79int gDeviceCount = 0; ␊
80␊
81BVRef bvr;␊
82BVRef menuBVR;␊
83BVRef bvChain;␊
84␊
85//static void selectBiosDevice(void);␊
86static unsigned long Adler32(unsigned char *buffer, long length);␊
87static bool getOSVersion(char *str);␊
88␊
89#ifndef OPTION_ROM␊
90static bool gUnloadPXEOnExit = false;␊
91#endif␊
92␊
93/*␊
94 * How long to wait (in seconds) to load the␊
95 * kernel after displaying the "boot:" prompt.␊
96 */␊
97#define kBootErrorTimeout 5␊
98␊
99/*␊
100 * Default path to kernel cache file␊
101 */␊
102#define kDefaultCachePath "/System/Library/Caches/com.apple.kernelcaches/kernelcache"␊
103␊
104//==========================================================================␊
105// Zero the BSS.␊
106␊
107static void zeroBSS(void)␊
108{␊
109␉extern char _DATA__bss__begin, _DATA__bss__end;␊
110␉extern char _DATA__common__begin, _DATA__common__end;␊
111␉␊
112␉bzero(&_DATA__bss__begin, (&_DATA__bss__end - &_DATA__bss__begin));␊
113␉bzero(&_DATA__common__begin, (&_DATA__common__end - &_DATA__common__begin));␊
114}␊
115␊
116//==========================================================================␊
117// Malloc error function␊
118␊
119static void malloc_error(char *addr, size_t size, const char *file, int line)␊
120{␊
121␉stop("\nMemory allocation error! Addr=0x%x, Size=0x%x, File=%s, Line=%d\n", (unsigned)addr, (unsigned)size, file, line);␊
122}␊
123␊
124//==========================================================================␊
125//Initializes the runtime. Right now this means zeroing the BSS and initializing malloc.␊
126//␊
127void initialize_runtime(void)␊
128{␊
129␉zeroBSS();␊
130␉malloc_init(0, 0, 0, malloc_error);␊
131}␊
132␊
133//==========================================================================␊
134// execKernel - Load the kernel image (mach-o) and jump to its entry point.␊
135␊
136static int ExecKernel(void *binary)␊
137{␊
138 entry_t kernelEntry;␊
139 int ret;␊
140␉␊
141 bootArgs->kaddr = bootArgs->ksize = 0;␊
142␉␊
143␉execute_hook("ExecKernel", (void*)binary, NULL, NULL, NULL);␊
144␊
145 ret = DecodeKernel(binary,␊
146 &kernelEntry,␊
147 (char **) &bootArgs->kaddr,␊
148 (int *)&bootArgs->ksize );␊
149␊
150 if ( ret != 0 )␊
151 return ret;␊
152␉␊
153 // Reserve space for boot args␊
154 reserveKernBootStruct();␊
155␉␊
156 // Load boot drivers from the specifed root path.␊
157␉␊
158 if (!gHaveKernelCache) {␊
159␉␉LoadDrivers("/");␊
160 }␊
161␉␊
162 clearActivityIndicator();␊
163␉␊
164 if (gErrors) {␊
165 printf("Errors encountered while starting up the computer.\n");␊
166 printf("Pausing %d seconds...\n", kBootErrorTimeout);␊
167 sleep(kBootErrorTimeout);␊
168 }␊
169␉␊
170␉md0Ramdisk();␊
171␉␊
172 setupFakeEfi();␊
173␉␉␊
174 verbose("Starting Darwin %s\n",( archCpuType == CPU_TYPE_I386 ) ? "x86" : "x86_64");␊
175#ifndef OPTION_ROM␊
176 // Cleanup the PXE base code.␊
177␉␊
178 if ( (gBootFileType == kNetworkDeviceType) && gUnloadPXEOnExit ) {␊
179␉␉if ( (ret = nbpUnloadBaseCode()) != nbpStatusSuccess )␊
180 {␊
181 ␉printf("nbpUnloadBaseCode error %d\n", (int) ret);␊
182 sleep(2);␊
183 }␊
184 }␊
185#endif ␊
186 bool dummyVal;␊
187␉if (getBoolForKey(kWaitForKeypressKey, &dummyVal, &bootInfo->bootConfig) && dummyVal) {␊
188␉␉printf("Press any key to continue...");␊
189␉␉getc();␊
190␉}␊
191␉␉␊
192␉if (bootArgs->Video.v_display == VGA_TEXT_MODE)␊
193␉{␊
194␉␉setVideoMode( GRAPHICS_MODE, 0 );␊
195␉}␊
196␉// Draw gray screen. NOTE: no boot image, that's in the gui module␊
197␉if(!gVerboseMode) drawColorRectangle(0, 0, DEFAULT_SCREEN_WIDTH, DEFAULT_SCREEN_HEIGHT, 0x01); ␊
198␊
199␉␊
200␉setupBooterLog();␊
201␉␊
202 finalizeBootStruct();␊
203 ␉␊
204␉execute_hook("Kernel Start", (void*)kernelEntry, (void*)bootArgs, NULL, NULL);␉// Notify modules that the kernel is about to be started␊
205␊
206␉// Jump to kernel's entry point. There's no going back now.␊
207 startprog( kernelEntry, bootArgs );␊
208␉␊
209 // Not reached␊
210␉␊
211 return 0;␊
212}␊
213␊
214//==========================================================================␊
215// This is the entrypoint from real-mode which functions exactly as it did␊
216// before. Multiboot does its own runtime initialization, does some of its␊
217// own things, and then calls common_boot.␊
218void boot(int biosdev)␊
219{␊
220␉initialize_runtime();␊
221␉// Enable A20 gate before accessing memory above 1Mb.␊
222␉enableA20();␊
223␉common_boot(biosdev);␊
224}␊
225␊
226//==========================================================================␊
227// The 'main' function for the booter. Called by boot0 when booting␊
228// from a block device, or by the network booter.␊
229//␊
230// arguments:␊
231// biosdev - Value passed from boot1/NBP to specify the device␊
232// that the booter was loaded from.␊
233//␊
234// If biosdev is kBIOSDevNetwork, then this function will return if␊
235// booting was unsuccessful. This allows the PXE firmware to try the␊
236// next boot device on its list.␊
237void common_boot(int biosdev)␊
238{␊
239 int status;␊
240 char *bootFile;␊
241 unsigned long adler32;␊
242 bool quiet;␊
243 bool firstRun = true;␊
244 bool instantMenu;␊
245#ifndef OPTION_ROM␊
246 bool rescanPrompt;␊
247#endif␊
248 unsigned int allowBVFlags = kBVFlagSystemVolume|kBVFlagForeignBoot;␊
249 unsigned int denyBVFlags = kBVFlagEFISystem;␊
250␉␊
251#ifndef OPTION_ROM␊
252 // Set reminder to unload the PXE base code. Neglect to unload␊
253 // the base code will result in a hang or kernel panic.␊
254 gUnloadPXEOnExit = true;␊
255#endif␊
256␉␊
257 // Record the device that the booter was loaded from.␊
258 gBIOSDev = biosdev & kBIOSDevMask;␊
259␉␊
260 // Initialize boot info structure.␊
261 initKernBootStruct();␊
262␉␊
263␉initBooterLog();␊
264␉␊
265 // Setup VGA text mode.␊
266 // Not sure if it is safe to call setVideoMode() before the␊
267 // config table has been loaded. Call video_mode() instead.␊
268#if DEBUG␊
269 printf("before video_mode\n");␊
270#endif␊
271 video_mode( 2 ); // 80x25 mono text mode.␊
272#if DEBUG␊
273 printf("after video_mode\n");␊
274#endif␊
275␉␊
276 // Scan and record the system's hardware information.␊
277 scan_platform();␊
278␉␊
279 // First get info for boot volume.␊
280 scanBootVolumes(gBIOSDev, 0);␊
281 bvChain = getBVChainForBIOSDev(gBIOSDev);␊
282 setBootGlobals(bvChain);␊
283␉␊
284 // Load boot.plist config file␊
285 status = loadSystemConfig(&bootInfo->bootConfig);␊
286␉␊
287 if (getBoolForKey(kQuietBootKey, &quiet, &bootInfo->bootConfig) && quiet) {␊
288 gBootMode |= kBootModeQuiet;␊
289 }␊
290␉␊
291 // Override firstRun to get to the boot menu instantly by setting "Instant Menu"=y in system config␊
292 if (getBoolForKey(kInsantMenuKey, &instantMenu, &bootInfo->bootConfig) && instantMenu) {␊
293 firstRun = false;␊
294 }␊
295␉␊
296#ifndef OPTION_ROM␊
297␉// Enable touching a single BIOS device only if "Scan Single Drive"=y is set in system config.␊
298 if (getBoolForKey(kScanSingleDriveKey, &gScanSingleDrive, &bootInfo->bootConfig) && gScanSingleDrive) {␊
299 gScanSingleDrive = true;␊
300 }␊
301␉␊
302␉// Create a list of partitions on device(s).␊
303 if (gScanSingleDrive)␊
304␉{␊
305␉␉scanBootVolumes(gBIOSDev, &bvCount);␊
306 } ␊
307␉else ␊
308#endif␊
309␉{␊
310␉␉scanDisks(gBIOSDev, &bvCount);␊
311 }␊
312␉␊
313␉// Create a separated bvr chain using the specified filters.␊
314 bvChain = newFilteredBVChain(0x80, 0xFF, allowBVFlags, denyBVFlags, &gDeviceCount);␊
315␉gBootVolume = selectBootVolume(bvChain);␊
316␉␊
317␉␊
318␉// Intialize module system␊
319␉if(init_module_system())␊
320␉{␊
321␉␉load_all_modules();␊
322␉}␊
323␉␊
324␉␊
325#ifndef OPTION_ROM␊
326 // Loading preboot ramdisk if exists.␊
327 loadPrebootRAMDisk();␊
328␉␊
329 // Disable rescan option by default␊
330 gEnableCDROMRescan = false;␊
331␉␊
332 // Enable it with Rescan=y in system config␊
333 if (getBoolForKey(kRescanKey, &gEnableCDROMRescan, &bootInfo->bootConfig) && gEnableCDROMRescan) {␊
334 gEnableCDROMRescan = true;␊
335 }␊
336␉␊
337 // Ask the user for Rescan option by setting "Rescan Prompt"=y in system config.␊
338 rescanPrompt = false;␊
339 if (getBoolForKey(kRescanPromptKey, &rescanPrompt , &bootInfo->bootConfig) && rescanPrompt && biosDevIsCDROM(gBIOSDev)) {␊
340 gEnableCDROMRescan = promptForRescanOption();␊
341 }␊
342#endif␊
343␉␊
344␊
345␉␊
346␉␊
347#if DEBUG␊
348 printf(" Default: %d, ->biosdev: %d, ->part_no: %d ->flags: %d\n", gBootVolume, gBootVolume->biosdev, gBootVolume->part_no, gBootVolume->flags);␊
349 printf(" bt(0,0): %d, ->biosdev: %d, ->part_no: %d ->flags: %d\n", gBIOSBootVolume, gBIOSBootVolume->biosdev, gBIOSBootVolume->part_no, gBIOSBootVolume->flags);␊
350 getc();␊
351#endif␊
352␉␊
353␉␊
354␉␊
355 setBootGlobals(bvChain);␊
356␉␊
357 // Parse args, load and start kernel.␊
358 while (1) {␊
359 const char *val;␊
360 int len;␊
361 int trycache;␊
362 long flags, cachetime, kerneltime, exttime, sleeptime, time;␊
363 int ret = -1;␊
364 void *binary = (void *)kLoadAddr;␊
365 bool tryresume;␊
366 bool tryresumedefault;␊
367 bool forceresume;␊
368␉␉␊
369 // additional variable for testing alternate kernel image locations on boot helper partitions.␊
370 char bootFileSpec[512];␊
371␉␉␊
372 // Initialize globals.␊
373␉␉␊
374 sysConfigValid = false;␊
375 gErrors = false;␊
376␉␉␊
377 status = getBootOptions(firstRun);␊
378 firstRun = false;␊
379 if (status == -1) continue;␊
380␉␉␊
381 status = processBootOptions();␊
382 // Status==1 means to chainboot␊
383 if ( status == 1 ) break;␊
384 // Status==-1 means that the config file couldn't be loaded or that gBootVolume is NULL␊
385 if ( status == -1 )␊
386 {␊
387␉␉␉// gBootVolume == NULL usually means the user hit escape.␊
388␉␉␉if(gBootVolume == NULL)␊
389␉␉␉{␊
390␉␉␉␉freeFilteredBVChain(bvChain);␊
391#ifndef OPTION_ROM␊
392␉␉␉␉if (gEnableCDROMRescan)␊
393␉␉␉␉␉rescanBIOSDevice(gBIOSDev);␊
394#endif␊
395␉␉␉␉␊
396␉␉␉␉bvChain = newFilteredBVChain(0x80, 0xFF, allowBVFlags, denyBVFlags, &gDeviceCount);␊
397␉␉␉␉setBootGlobals(bvChain);␊
398␉␉␉}␊
399␉␉␉continue;␊
400 }␊
401␉␉␊
402␉␉␊
403␉␉␊
404 // Other status (e.g. 0) means that we should proceed with boot.␊
405␉␉␉␉␊
406␉␉// Notify moduals that we are attempting to boot␊
407␉␉execute_hook("PreBoot", NULL, NULL, NULL, NULL);␊
408␉␉␊
409␉␉// Find out which version mac os we're booting.␊
410␉␉getOSVersion(gMacOSVersion);␊
411␉␉␊
412␉␉if (platformCPUFeature(CPU_FEATURE_EM64T)) {␊
413␉␉␉archCpuType = CPU_TYPE_X86_64;␊
414␉␉} else {␊
415␉␉␉archCpuType = CPU_TYPE_I386;␊
416␉␉}␊
417␉␉if (getValueForKey(karch, &val, &len, &bootInfo->bootConfig)) {␊
418␉␉␉if (strncmp(val, "i386", 4) == 0) {␊
419␉␉␉␉archCpuType = CPU_TYPE_I386;␊
420␉␉␉}␊
421␉␉}␊
422␉␉␊
423␉␉if (!getBoolForKey (kWake, &tryresume, &bootInfo->bootConfig)) {␊
424␉␉␉tryresume = true;␊
425␉␉␉tryresumedefault = true;␊
426␉␉} else {␊
427␉␉␉tryresumedefault = false;␊
428␉␉}␊
429␉␉␊
430␉␉if (!getBoolForKey (kForceWake, &forceresume, &bootInfo->bootConfig)) {␊
431␉␉␉forceresume = false;␊
432␉␉}␊
433␉␉␊
434␉␉if (forceresume) {␊
435␉␉␉tryresume = true;␊
436␉␉␉tryresumedefault = false;␊
437␉␉}␊
438␉␉␊
439␉␉while (tryresume) {␊
440␉␉␉const char *tmp;␊
441␉␉␉BVRef bvr;␊
442␉␉␉if (!getValueForKey(kWakeImage, &val, &len, &bootInfo->bootConfig))␊
443␉␉␉␉val="/private/var/vm/sleepimage";␊
444␉␉␉␊
445␉␉␉// Do this first to be sure that root volume is mounted␊
446␉␉␉ret = GetFileInfo(0, val, &flags, &sleeptime);␊
447␉␉␉␊
448␉␉␉if ((bvr = getBootVolumeRef(val, &tmp)) == NULL)␊
449␉␉␉␉break;␊
450␉␉␉␊
451␉␉␉// Can't check if it was hibernation Wake=y is required␊
452␉␉␉if (bvr->modTime == 0 && tryresumedefault)␊
453␉␉␉␉break;␊
454␉␉␉␊
455␉␉␉if ((ret != 0) || ((flags & kFileTypeMask) != kFileTypeFlat))␊
456␉␉␉␉break;␊
457␉␉␉␊
458␉␉␉if (!forceresume && ((sleeptime+3)<bvr->modTime)) {␊
459␉␉␉␉printf ("Hibernate image is too old by %d seconds. Use ForceWake=y to override\n",bvr->modTime-sleeptime);␊
460␉␉␉␉break;␊
461␉␉␉}␊
462␉␉␉␊
463␉␉␉HibernateBoot((char *)val);␊
464␉␉␉break;␊
465␉␉}␊
466␉␉␊
467 // Reset cache name.␊
468 bzero(gCacheNameAdler + 64, sizeof(gCacheNameAdler) - 64);␊
469␉␉␊
470 sprintf(gCacheNameAdler + 64, "%s,%s", gRootDevice, bootInfo->bootFile);␊
471␉␉␊
472 adler32 = Adler32((unsigned char *)gCacheNameAdler, sizeof(gCacheNameAdler));␊
473␉␉␊
474 if (getValueForKey(kKernelCacheKey, &val, &len, &bootInfo->bootConfig)) {␊
475 strlcpy(gBootKernelCacheFile, val, len+1);␊
476 } else {␊
477 sprintf(gBootKernelCacheFile, "%s.%08lX", kDefaultCachePath, adler32);␊
478 }␊
479␉␉␊
480 // Check for cache file.␊
481 trycache = (((gBootMode & kBootModeSafe) == 0) &&␊
482 !gOverrideKernel &&␊
483 (gBootFileType == kBlockDeviceType) &&␊
484 (gMKextName[0] == '\0') &&␊
485 (gBootKernelCacheFile[0] != '\0'));␊
486␉␉␊
487␉␉verbose("Loading Darwin %s\n", gMacOSVersion);␊
488␉␉␊
489 if (trycache) do {␊
490␉␉␉␊
491 // if we haven't found the kernel yet, don't use the cache␊
492 ret = GetFileInfo(NULL, bootInfo->bootFile, &flags, &kerneltime);␊
493 if ((ret != 0) || ((flags & kFileTypeMask) != kFileTypeFlat)) {␊
494 trycache = 0;␊
495 break;␊
496 }␊
497 ret = GetFileInfo(NULL, gBootKernelCacheFile, &flags, &cachetime);␊
498 if ((ret != 0) || ((flags & kFileTypeMask) != kFileTypeFlat)␊
499 || (cachetime < kerneltime)) {␊
500 trycache = 0;␊
501 break;␊
502 }␊
503 ret = GetFileInfo("/System/Library/", "Extensions", &flags, &exttime);␊
504 if ((ret == 0) && ((flags & kFileTypeMask) == kFileTypeDirectory)␊
505 && (cachetime < exttime)) {␊
506 trycache = 0;␊
507 break;␊
508 }␊
509 if (kerneltime > exttime) {␊
510 exttime = kerneltime;␊
511 }␊
512 if (cachetime != (exttime + 1)) {␊
513 trycache = 0;␊
514 break;␊
515 }␊
516 } while (0);␊
517␉␉␊
518 do {␊
519 if (trycache) {␊
520 bootFile = gBootKernelCacheFile;␊
521 verbose("Loading kernel cache %s\n", bootFile);␊
522 ret = LoadFile(bootFile);␊
523 binary = (void *)kLoadAddr;␊
524 if (ret >= 0) {␊
525 break;␊
526 }␊
527 }␊
528 bootFile = bootInfo->bootFile;␊
529␉␉␉␊
530 // Try to load kernel image from alternate locations on boot helper partitions.␊
531 sprintf(bootFileSpec, "com.apple.boot.P/%s", bootFile);␊
532 ret = GetFileInfo(NULL, bootFileSpec, &flags, &time); ␊
533 ␉ ␉ if (ret == -1)␊
534 ␉ ␉ {␊
535␉␉␉␉sprintf(bootFileSpec, "com.apple.boot.R/%s", bootFile);␊
536␉␉␉␉ret = GetFileInfo(NULL, bootFileSpec, &flags, &time); ␊
537␉␉␉␉if (ret == -1)␊
538␉␉␉␉{␊
539␉␉␉␉␉sprintf(bootFileSpec, "com.apple.boot.S/%s", bootFile);␊
540␉␉␉␉␉ret = GetFileInfo(NULL, bootFileSpec, &flags, &time); ␊
541␉␉␉␉␉if (ret == -1)␊
542␉␉␉␉␉{␊
543␉␉␉␉␉␉// Not found any alternate locations, using the original kernel image path.␊
544␉␉␉␉␉␉strcpy(bootFileSpec, bootFile);␊
545␉␉␉␉␉}␊
546␉␉␉␉}␊
547 }␊
548␉␉␉␊
549 verbose("Loading kernel %s\n", bootFileSpec);␊
550 ret = LoadThinFatFile(bootFileSpec, &binary);␊
551 if (ret <= 0 && archCpuType == CPU_TYPE_X86_64)␊
552 {␊
553␉␉␉␉archCpuType = CPU_TYPE_I386;␊
554␉␉␉␉ret = LoadThinFatFile(bootFileSpec, &binary);␉␉␉␉␊
555 }␊
556␉␉␉␊
557 } while (0);␊
558␉␉␊
559 clearActivityIndicator();␊
560#if DEBUG␊
561 printf("Pausing...");␊
562 sleep(8);␊
563#endif␊
564␉␉␊
565 if (ret <= 0) {␊
566␉␉␉printf("Can't find %s\n", bootFile);␊
567␉␉␉␊
568␉␉␉sleep(1);␊
569#ifndef OPTION_ROM␊
570 if (gBootFileType == kNetworkDeviceType) {␊
571 // Return control back to PXE. Don't unload PXE base code.␊
572 gUnloadPXEOnExit = false;␊
573 break;␊
574 }␊
575#endif␊
576 } else {␊
577 /* Won't return if successful. */␊
578␉␉␉// Notify modules that ExecKernel is about to be called␊
579 ret = ExecKernel(binary);␊
580 }␊
581 }␊
582 ␊
583 // chainboot␊
584 if (status==1) {␊
585␉␉if (getVideoMode() == GRAPHICS_MODE) {␉// if we are already in graphics-mode,␊
586␉␉␉setVideoMode(VGA_TEXT_MODE, 0);␉// switch back to text mode␊
587␉␉}␊
588 }␊
589#ifndef OPTION_ROM␊
590 if ((gBootFileType == kNetworkDeviceType) && gUnloadPXEOnExit) {␊
591␉␉nbpUnloadBaseCode();␊
592 }␊
593#endif␊
594}␊
595␊
596/*!␊
597 Selects a new BIOS device, taking care to update the global state appropriately.␊
598 */␊
599/*␊
600 static void selectBiosDevice(void)␊
601 {␊
602 struct DiskBVMap *oldMap = diskResetBootVolumes(gBIOSDev);␊
603 CacheReset();␊
604 diskFreeMap(oldMap);␊
605 oldMap = NULL;␊
606 ␊
607 int dev = selectAlternateBootDevice(gBIOSDev);␊
608 ␊
609 BVRef bvchain = scanBootVolumes(dev, 0);␊
610 BVRef bootVol = selectBootVolume(bvchain);␊
611 gBootVolume = bootVol;␊
612 setRootVolume(bootVol);␊
613 gBIOSDev = dev;␊
614 }␊
615 */␊
616␊
617static bool getOSVersion(char *str)␊
618{␊
619␉bool valid = false;␊
620␉config_file_t systemVersion;␊
621␉const char *val;␊
622␉int len;␊
623␉␊
624␉if (!loadConfigFile("System/Library/CoreServices/SystemVersion.plist", &systemVersion))␊
625␉{␊
626␉␉valid = true;␊
627␉}␊
628␉else if (!loadConfigFile("System/Library/CoreServices/ServerVersion.plist", &systemVersion))␊
629␉{␊
630␉␉valid = true;␊
631␉}␊
632␉␊
633␉if (valid)␊
634␉{␊
635␉␉if (getValueForKey(kProductVersion, &val, &len, &systemVersion))␊
636␉␉{␊
637␉␉␉// getValueForKey uses const char for val␊
638␉␉␉// so copy it and trim␊
639␉␉␉*str = '\0';␊
640␉␉␉strncat(str, val, MIN(len, 4));␊
641␉␉}␊
642␉␉else␊
643␉␉␉valid = false;␊
644␉}␊
645␉␊
646␉return valid;␊
647}␊
648␊
649#define BASE 65521L /* largest prime smaller than 65536 */␊
650#define NMAX 5000␊
651// NMAX (was 5521) the largest n such that 255n(n+1)/2 + (n+1)(BASE-1) <= 2^32-1␊
652␊
653#define DO1(buf,i) {s1 += buf[i]; s2 += s1;}␊
654#define DO2(buf,i) DO1(buf,i); DO1(buf,i+1);␊
655#define DO4(buf,i) DO2(buf,i); DO2(buf,i+2);␊
656#define DO8(buf,i) DO4(buf,i); DO4(buf,i+4);␊
657#define DO16(buf) DO8(buf,0); DO8(buf,8);␊
658␊
659unsigned long Adler32(unsigned char *buf, long len)␊
660{␊
661 unsigned long s1 = 1; // adler & 0xffff;␊
662 unsigned long s2 = 0; // (adler >> 16) & 0xffff;␊
663 unsigned long result;␊
664 int k;␊
665␉␊
666 while (len > 0) {␊
667 k = len < NMAX ? len : NMAX;␊
668 len -= k;␊
669 while (k >= 16) {␊
670 DO16(buf);␊
671 buf += 16;␊
672 k -= 16;␊
673 }␊
674 if (k != 0) do {␊
675 s1 += *buf++;␊
676 s2 += s1;␊
677 } while (--k);␊
678 s1 %= BASE;␊
679 s2 %= BASE;␊
680 }␊
681 result = (s2 << 16) | s1;␊
682 return OSSwapHostToBigInt32(result);␊
683}␊
684

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